Labconco Protector 50600 User Manual page 29

Pressure Change Method Leak Testing Summary
(ISO-10648-2)
The method consists of measuring the pressure rise per unit time after establishing
a negative pressure in the main chamber of the glove box. Use
-1000 Pa for the acceptance test and -250 Pa for the operational test. The hourly
leak rate includes adjustments for barometric pressure and temperature changes
which can be calculated as T
T = (60/t) * ((PnT /P
f 1 1
t is the duration of the test in minutes.
P is the absolute pressure (ambient barometric pressure minus under pressure) at
1
the first reading in Pascals.
Pn is the absolute pressure (ambient barometric pressure minus under pressure) at
the last reading in Pascals.
T is the temperature at the first reading in Kelvin.
1
Tn is the temperature at the last reading in Kelvin.
60 represents 60 minutes in an hour.
T in Kelvin is equal to degrees Celsius + 273.
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:
f
Tn) -1) where
Chapter 3: Getting Started
25